ice: drop ice_pf_fwlog_update_module()

ice: drop ice_pf_fwlog_update_module()

Any other access to fwlog_cfg isn't done through a function. Follow
scheme that is used to access other fwlog_cfg elements from debugfs and
write to the log_level directly.

ice_pf_fwlog_update_module() is called only twice (from one function).
Remove it.

Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
Reviewed-by: Larysa Zaremba <larysa.zaremba@intel.com>
Signed-off-by: Michal Swiatkowski <michal.swiatkowski@linux.intel.com>
Reviewed-by: Aleksandr Loktionov <aleksandr.loktionov@intel.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>